Verhandelingen Volume 27

Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 edition. Excerpt: ...mode of transport, which was, as related before, always by water. On the ltapicurii 12 chronometers were employed, on the Parnahyba 9, or rather, 3 out of the 12 have been afterwards rejected. For the trip on the Oapim, 2d of August to 6th of Sept. 1883, the same method could be followed. The position of Para, where the voyage began and ended, was taken from the U. S. Survey. However, our position not being exactly the same, the distances between the Americans' pillar, the pillar erected in the garden of the house in the upper part of the Estrada-S. Jeronimo in 1881, the house in the same street lower down which we occupied in 1883, and the observatory in the Estrada-de-Nw zareth were directly measured. This work, through different, partially very busy, streets, and not with the best instrument, was of inferior quality. So the longitudes and latitudes, deduced from the American values are given in round numbers, as follows: Eleven chronometers were employed. and the transport was again by water. During this voyage and the next, however, many of the observations are of an indifferent character, because the sun was scarcely ever clearly visible. It was the period of the crimson twilights, which have so much interested the scientific world. It may be stated here, that we saw them more than amonth before the eruption of Krakatahoe, of which fact our notes in some places bear witness. During a great many weeks the sun at its best was often not much more than an oilstain on a scrap of paper, and observations were an unsatisfactory thing to do. On the Tocantins, 9th of Sept. to 19"' of Oct., 10 chronometers were employed. As has been described before, this trip was not accomplished in the usual way. In three places observations...show more